There definitely will be a biometrics appointment before the interview. This is part of the "required record checks."

I will be traveling to new York on plane I will be married a day before I leave am not illegal until Aug will I be stop?

You have not indicated what is your current "not illegal" status.

I am AOS and used EAD for working. How can I transfer for to H4?

This depends on whether you have been maintaining a nonimmigrant status while your AOS was pending.

I-94 validity Issue.

You should ask your H-1B employer's attorney to clear this matter up. There is some information lacking in this inquiry.

Can h4 EAD be applied if COS from H1-h4 is in progress

The H-4 EAD is not yet available and you must have an approved H-4, per the proposed rules, to apply.

H1-B transfer. When can I start working for the new employer?

You can work for the new employer upon the proper filing of the new I-129H.

Working on OPT, filing H4 with H1B transfer

Yes, your OPT is still valid until it expires or your status is changed.

I have citizenship interview Monday but just found out in the copy of my application have some mistake how can I correct it ?

You can correct any missing or incorrect information at the interview. Bring your passports to corroborate any changes in absences information.

Transit B2 visa to a F1.

If a school issues an I-20 while you are still in legal status and with enough time for USCIS to approve a change of status before the school term...

Sir I got it USA Orlando hotel storekeeper job offer letter and sponcers letter.then H2B visa also how I believe these all tru

If it sounds "too good to be true," then it probably is not true. Consult with an attorney.